Fastener

Abstract

The fastener disclosed by the invention comprises a filament, a head provided to one end of the filament, and a socket provided to the other end of the filament, these parts being integrally formed of synthetic resin, the head having a groove extending in the direction of its axis and a rib formed in the groove, the head also having a skirt on the head around the groove and flaring away from the front end of the head, the skirt being interrupted at one part by the groove, the socket having an insertion hole in which an annular flange is provided for engagement with the skirt.

I claim: 
     
       1. In a fastener having a filament, a head at one end of the filament and a socket at the other end of the filament with an insertion hole therein, these parts being integrally formed of synthetic resin, the invention characterized by: the head having an axially extending, collapse-facilitating groove;   a skirt on the head extending therearound and being interrupted by the groove;   an annular flange in the insertion hole of the socket for engagement beneath the skirt when the head is pressed through the insertion hole;   wherein the head is provided with a rib disposed in the groove for limiting collapse of the head.   
     
     
       2. A fastener as set forth in claim 1, wherein the rear end surface of the skirt is inclined making an acute angle with the axis of the head. 
     
     
       3. A fastener as set forth in claim 1, wherein the rib is cylindrical and provided over the entire length of the groove. 
     
     
       4. A fastener as set forth in claim 1, wherein the thickness of the annular flange progressively increases toward the axis of the socket. 
     
     
       5. A fastener as set forth in claim 1, wherein a groove-like slit is formed in the rib along its entire length.